Malicious PDF — malware analysis report

Static analysis result for SHA-256 287846c57faa3999…

MALICIOUS

PDF

82.0 KB Created: 2021-03-27 10:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 813c800fc82c6f2a45dd853c9c45dd49 SHA-1: a8e6dc599ef478736ba0830f46747ced98a49540 SHA-256: 287846c57faa39997874e3aded1aae4096c427ff0c82a9f952b4732e54f06f84
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/award?keyword=anomalias+congenitas+mas+comunes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488323/normal_601e39f18999f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486521/normal_5fca78b16ab70.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/kawebanesamudebup.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/sanerogowufax-gujujulepuje-tafurugegadema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_60332ef6c43c1.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/xebofivofufawimavifikapi.pdfIn PDF document text
    • http://cethq.xyz/are_bookshelf_speakers_better_than_floorstanding_speakerssep24.pdfIn PDF document text
    • https://filudatobo.weebly.com/uploads/1/3/2/6/132681654/5373075.pdfIn PDF document text
    • http://localdesign.me/mavobasoey2.pdfIn PDF document text
    • http://natikolom.site/dovizanarabozatamisalimoolbix.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/1285537.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/sosugop.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/2006_vw_jetta_tdi_owners_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_6e0066145a564da3a8cff3cea51c43e0.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_6b9ccb68c34044848c9163bef1910f0c.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_69403263574d47b7be1d13525b902f90.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_178ba4c8e3af44cfaab789c27374db50.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_3968cfc9db4847758a45c4e126e980d0.pdf?index=trueIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_e00eb05e1e2346c78022c2fa343a24f9.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_84e081d7129540788e56c48483d399d1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5368 bytes
SHA-256: ebe7f4cd91fc2ab9d195b581b71771cae232fc4b9760bae495c074772e71c27c
font_01_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 13140 bytes
SHA-256: fcbdfc81fedc1cfa84a8c68df8fe482c567affb0c781b7b0abf9bab0b8318807